Chair-iron.



H. w. BOLENS.'

CHAIR IRON. Y

APPLICATION FILED III/uma. 1918. l

1,272,365. Patnted July 16, 1918.

2 SHEETS-SHEET l.

m: Nnkms mpngmumu.. wasnmaron a c HARRY W. BOLENS, OF PORT-WASHINGTON, WISCONSIN.

CHAIR-IRON.

Specification of Letters Patent.

Patented July 16, 1918.

Application filed March 18. 1918. Serial No. 223,193.

` To all whom 'it may concern.'

Be it known thatl, HARRY W. BoLENs, a citizen of the United States, residing at Port lVashington, in the county of Ozaukee and the State of lVisconsin, have invented a new and useful Improvement in Chair-Irons, of which the following is a specification.

This invention relates to improvements in that construction of chair-ironsemployed in revolving chairs and particularly typiiied in the construction of chair-iron illustrated and described in the pending application of one Charles J. rTravers7 filed August 4,1917, Serial No. 184,395, or in any other construction of chair-,iron involving a hollow vhub about which are fitted radiating supportinglegs clamped between upper and lower plates and in which the latter plate is independent of and slipped over the lower end of the hub.

In the construction of chair-iron referred to above, the hollow hub is provided with intermediary radiating lugswhich engage in corresponding openings formed in the ends of the radiating legs. The upper end of the hub is provided with an integral flange and below the same and the upper surfaces of the legs is located the upper clamping-plate, screws passing through the plate engage the legs. Slippedover the lower end ofthe hub and screwed to the undersides ofthe legs is the lower clamping-plate, and betweenthe legs and engaged by` theupper clamping* tion of chair-iron to which my improveplate, are iilling-blocks which rest at their lower ends upon the lower clampingeplate and have their inner vertical edges mortised to correspond with those of thelegs, whereby through the mediumof the upper screws thel upper clamping-plate may be drawn down upon the upper extended ends. of the filling-blocks and thus the latter forced inwardly so as to tightly lwedge between the legs. In this construction it will be noted that much of the rigidity of the base thus formed depends upon. the vconnection between the hub'and the legs, thatis, the

radiating studs and Athe openings in thelegs for their reception, so that in the event of the wood drying out bylong use and therefore shrinking, thelegs are liable to become loose and thus to a certain extent the lbase will lose its original rigidity.v

My present invention has forV its ob]ect to prevent this possibility'and also to reduce the cost ofmanufacture in a chair-iron of the type illustrated and referred to.

With these objects in view, the invention consists in a means for securing the bottom clamping-plate to the lower end of the hollow hub, (whereby l am enabled to omit the hereinbeforereferred to,) thus clamping the legs in position and also saving the cost of material and workmanship in forming the lugs and holes.

Referring to the drawings:

Figure l is a vertical longitudinal sectional view, the lower portion ofthe hub being illustrated in side elevation, of a chairand embodying occupy after the bottom clamping-plate has been slipped upon the lower end of the hub and before the plate has been rotated'to a binding locked position upon the hub; and

,Fig 4 is a bottom the bored hub. i

Similar numerals of reference indicate similar' parts in all the figures of thedrawings. i Referring tothe drawings for `the pur- 4sie.

plan viewin detail of .6o rad1at1ng studs and corresponding holes pose of describing particularly the typificaments are applicable, l designates the hub,

usually cylindrical;l but which may be of any an integral annular flange 3, at one side ofV which is formed a short vertical standard 4,

transversely perforated and threaded, as at 5, for a stop-screw 6, the inner end of which Vextends inwardly to a point beyond the standard.

Mounted to revolve within the bore 2 of the hub, is the usual adjusting-standard 10, provided with the longitudinal groovell and with threads which in the present instance terminate above the lower end of the standard.

Fitting the hub 2 and positioned immo# diately below the annular flange of the same is the upper 'leg clamping-plate 13, preferably of concave-convex form in cross-section and'provided with screw-holes 14:, co-

incident with the legs of the chair-base.

Fitting the lower end of the hollow hub is the lower leg clainlaing-plate 15, and the same consists of an annular ring shaped plate 16, and radial arms 17, corresponding :with` the position and curvature ofthe;

undersides of the legs.

The legs 18, may be of any design desired,"

and their inner ends may be slightly curved to conform yto the exterior ofthe hub. The vertical innercorners ofthe legs may be cut away or chainfered, as at 20, and'fbetween each pair of legs is positioned a filler-.block 21, of 'substantially ltriangular shape, the inneredgefof such block being formed with an--extensionk22, in this instance of angular shape Lso as to adapt'it-tofit snugly between and conform to the portionsv20 of the adjacent legs. lVhen.inpositioin it will be seen thatthe legsL and blocks combine to 'forni the circle about the hollow hub.

Inthepresent.instance there are punched.

whiclrscrews 27' are inserted downwardl i a .Yv

through the'I screw holes 14 of the upper plate 13, and screws 28, are insertedupwardly.- through the holes 2l: ofthe tongues 2fand into the undersdes ofthe legs.

The., filler-blocks. are inclined and `inserted upper end first under the concavo-convexed plate 1?, andSub'sequentlyl forcedv upward andinward, thusbringingthem into vertical positionfand causinguthem kto snugly fit between the legs.: Nails 39, (see dotted lines Fig. are then driven: upwardlythrouglr tlreperforations vor nail-holesin the bottoni leg clamping-'plate and into said blocks,

wherebyY the latter when `once, positioned vand:securedr arefprevented from lateral displacement.- Y

The adjusting-standard 1() carries'- the.k

usuali; Jfwasher 29,; which; by means'- of" a spline, 31),'. engages the grofwe,Y 11 ofthe; ad1

jlistingstandard, whereby the washer is prevented.fronrrotation independent of the.

standard? and` yet is,` slidably mounted there on. The washer is of the well .known constructiem its uriner Side. being Provided with Shallow.. radialribs designed to lightly engage'. with corresponding grooves formed in thel underside of theV hub 31 of the usual hand-wheel 32, the hub being countersunk on its underside tome-ceivegthe washer. To prevent the separation of the hub, handwheel, and washer, the hub is provided with aneXternal annular flange 33, over which normally engages the before-mentioned screw 6.v

The hand-wheel v1is threaded on the screw or adjusting-standard, and by rotation; 0f the'sanie, it will be seen thatithe wheeljbein'g-helddown by the screw' 6,1 the screw or standard-may be fed up or down and thusv the chair, which it will be understood, is supported by the usualineans upon the upper end ofthe standard, willbe raised or lowered. On the` other hand, it willlbe apparent that as the occupant revolves the chair, and" consequently, the screw ,or adjustingstandard, the hand -wheel and Jg washe'rv will revolve together,y the latter bearingpupon and moving overl the upper side ofthe annular flange 3vk of the hub...

Thus far l have. described the typical construction of chair-iron tow-hich my inn-v proveinentsrefer, such bein-gi the construction illustrated and described in the pend-V ingapplieation Vhereinbefore referred to. I'

will now describel in detail my improvements.

I'preferably though not necessarily omit thel radiating lugs of the hub or their equival'ents, and consequentlyV the holes in the ends ofjthe legs designed for their reception, thus, in the eventof such omission, saving considera-ble expense in the manufacture ofthe chair-loase V Y Near its lower end VVI provide the hubf'with an external groove 35, tlie'sanieb'eing annular, shallow andeccentricallypositioned with. relation to the' ,hub in which ity isA formed; andI preferably provide a sha1# lowivertical groove 36 (see F 4,) extendingffromf th'elower end ofthe hub to the groove 35..

p Y V The .cylindrical open-ing8,7, formed in the annular plate .or ring-portion of the lower leg-lclampingfpla 15,;v correspondsin diam'-` eter-"with the hub, in thepresent instance,v and therefore is slightlyA larger than the eccentric grooveV 35;.. Aty one point of-Yits inner edge this; ring isprovided with a narrow lug or lnwardfexten'sion 38, the lat.- ter and the vertlcalgrooy'e beinggof such relative* size as -to permit of the'- travel ofl thetlug.A or.V extension alongsaid groove until therlngfor extension reaches the? eccentricannular'groeve with.. whichr said vertical groorecommunicates.

the end of the huh, the/lugVV or extension 38 passingf-upf` thegroove. 36 offthenhub and entering theeccentric annular groove 35 at thedeepest pointof the latter, After this, in order to lock the lower leg clamping-plate in position upon the hub, itis simply necessary to rotate said plate in either direction7 or until the lug or eXtenf, sion 38 of the plate binds firmly against the innnovably upon the hub, after which the remaining parts of the base may be positioned with relation to the lower plate and all secured together in a manner hereinbefore referred to or some equivalent manner, as may be preferred.

Having described my invention, what I claim is:

l. In a chair-iron, the combination with a bored hub, an upper leg clamping-means,

and radiating legs, of a lower leg clampingplate, said latter plate being adapted to slip over the lower end of the hub, and means for securing said lower leg clamping-plate in position upon the hub by a partial rotation of the plate thereon.

'In a chair-iron, the combination with a bored hub7 an upper leg clamping-means, and radiating legs, of an annular groove formed in said hub near its lower end, a

groove leading thereto and from the end of 'the hub, a lower leg clamping-plate adapted to slip over the lower end of the hub and provided with an internal extension adapted to engage the grooves of the hub, and means for securing the leg clamping-plate within the annular groove of the hub subsequent to a partial rotation of said plate.

3. In a chair-iron, the combination with a bored hub, an upper leg clamping-means, and radiating legs, of an annular groove formed in the hub and eccentrically with relation to the same, a groove leading to the annular groove and from the lower end of the hub and communicating with the groove at its deepest point, and a lower leg clan1ping-plate havingan annular opening provided with an inward extension or lug, said plate being adapted to be slipped over the end of the hub and into the annular groove thereof and the extension or lug being adapted to travel in the communicating groove and into the annular groove, whereby when said plate and lug are 1n engagement with the annular groove of the hub and said plate partially rotated the lug or extension is caused to bind against the hub within the groove and thus secure the plate in position.

HARRY W. BOLENS.

Witnesses T. H. IRLWIG, T. A. BOERNER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

